System for unipolar high-frequency treatment



0a. 19,1926. wossg H. HERRMANN SYSTEM FOR UNIPOLAR HIGH FREQUENCY TREATMENT Filed May 26, 1924 HELL L o;

" l UNITED STATE HEINRICH HERRMANN, F BERLIN', 'GEBMANY, ASSIGNOR T0 ELCTRIGITTSGE-- Patented Oct. 19, 1926.

'PATENT' oFF-ICE- SELLSCHAFT, SANITAS M. B. H., 0F FRIEDRICHSTRASSE, BERLIN, GERMANY.

'- SYSTEM non 'UNreoLAnnIGn-FREQUENCY TREATMENT. l

,- Application led May 26,` 1924, Serial No. 716,057, a.m1 in Germany June 6, 1923. l

My invention relatestb improvements in unipolar high frequency electric ther peu- 'tical-apparatus, and the objectof the im. provements is lto provide an apparatus having means for protecting the patient against injury by electric current of the supply wiresy or primary circuit also when using i a metallic electrode.

With this object inI view I provide a protective condenser intermediate the 'electrode and the'primary cir-Y cuit, which does not interfere with the transmission of the liigh frequency current,

but reduces the primary current to zero or so far -that it does not endanger the patient.,

For the purpose of explaining the inven- -tion several examples emb'odying'the. same have been shown in the accompanying drawing in which the same reference characters have been used in all the views to-indicate `corresponding parts. In said drawing,

Fig. y1 is adiagrammatical View showing the electricalconnections of the systemk Fig. -2 is an elevation partly in section Ashowing the apparatus comprising #the system shown in Fig. 1,

Fig. 3 is a diagrammatical view showing a modification of the system,

Fig. 4 is a diagrammatical view showing Aan apparatus comprising the system shown Fig. 3,

l Figs, 5 to 13 are diagrammatical views showing furtherl modifications of the apparatus.- v

fIn he example shown in Figs.A 1 and 2 to the supply wires a, -a magnetic hammer circuit a are connected.) The circuit a includes the primary ,d o f atransformer ifa -anda condenser c1. The electrode 'i is connected with the'secondaryory Tesla coil' e 'o f the transformer. So far the system is ,A known -in'the art. In my improved system a vcondenser f is provided atthe part where ordinarily the Telsa coil e connectedl tothe free terminal of vthe electrode is connected to the oscillation circuitywhich condenser ,interrupts the conductor connecting the electrode and the oscillation circuit c or the net @,butbringsthe terminal of the Tesla coil to earth potential in the same way as is done by the conductive connection hereto-r fore provided, so that the eiiect is in no way impaired.

lIn the construction of" the apparatus including my improved system the trans-I the instrument, and the condenser g, f1, f,

is disposed between the magnet coil b1 of the hammer break and the Tesla coil e.

l As shown the condenser comprises aninsulating disk g and metal disksfffl and f2. In the'modication shown inV Fig. 3 the general arrangement of the system is the same asv hasbeen described with reference to Figs. 1 and 2, but the condenser f3 is disposed between .the high .potential termi-' nal of the Tesa coil ea and the electrode is. Alsoin this 4case the condenser breaks the conductor connecting the electrode is and l the oscillation circuit c or the net,- but it does not'interfere with. the transmission of the high' frequency oscillations.

F-ig. 4 shows an instrument including the system shown in Fig. 3.- As shown one of t e metal ldisks ff of the condenserl provides the terminal of the Tesla coil e4 and it is acted upony 'by a spring fn, forcing the same against a loosely mounted insulating plate `g4 and the latter against a metal disk connected with a c ap fm. providing a seat the electrode i4. `The tubular casing orA handle carrying the said parts has received the character .c.

In the modification shown 'in' Fig.5 a `metallic electrode e is provided, and the terminal .of the` electrode seated in the cap m of the handle la is equipped with a cap o6 of i atin material, .which cap cooperates with t e metal electrode provided thereon and the metal of the cap me to form the condenser. A Y l In the construction shown`in Fig. 6l the condenser. is provided betweenthe electrode 7 anda pa'rt j" designed to berpassed into 'the cap of the, handle. The parts i7 and'j'.' both consist ofmetal and they are made integral with\anges and j respectively, which are separated .from each other by an insulating disk'g;7 of mica andare connected A by dielectric parts` gf.

Fig. 7 shows a modification in 'which the? -electrode s is equlppedwith `a cap 81 ref ceivinga vacuum tube 1 provided at its vopposite end with a c ap je'. VThe tube r,

kits gas filling, and the-caps 81 and j act as a double condenser, the gas filling having the functionof'one of the metallic disksv l tube, though there is a certain condenser action particularly if the electrode s is provided with a blunt end.- Therefore in some cases both ends of the tube T10 may be provided with an electrode s, as is shown in Fig. 10. In this case the main action of the tube is not a condenser action but a spark discharge through the gas within the tube 1'10 which discharge, however, takes place through a high resistance dependin 'on the relative distance and condition of t e electrodes and the character and other condi# tions of the gas confined within the tube, so that the high pressure high frequency oscillations of the Tesla current can pass througlh the tube, while there is no passage of t e current of the net a.

The effect of a condenser constructed ac-k cording to Figs. 7 and 8 is improved by coating the tube internally with metal, which metal covers either the whole inner surface of the tube, or onlythe part of the surface corresponding tothe caps 81 and 7'7 of Fig. 8, or the part of the surface corresponding to the cap 9 in Fig. 8. The coating may be in the form of a metal deposit, or of allling of mercury, metal cuttings, or graphite. f

Fig. 10 shows avtube r11 in which the metal deposit is provided only at the part of the inner surface which corresponds to the cap 11, while in Fig. 11 the metal -deposit covers the whole inner surface of the tube fr, or thel tube is entirely filled with mercury, graphite, or the like.

In Fig. 12 I have shown a modification which is similar to the one 'shown in Fig. 9, which, however, shows pure condenser-action, a glass partition u being provided within the tube r at the middle thereof so that no current can pass through the tube, the

partition providing the insulator of thecon denser the metallic parts of which are represented by the gas. confined within the chambers of the tube. Also in this case'the wallsI of the chambers may be internally .coated with metal, or the chambers m'ay be filled with electric material such as mercury, metal cuttings, graphite, or the like as shown in Fig. 13.

`When filling the tube shown in Fig.` 9 with I powdered graphite or the like, as has been indicated in Fig. 11 almost pure resistance action 1s produced. The same is the case, if

instead yof `the tube a rod of a material of The hiihohmic resistance-such as is provided in the system. In both cases the high frequency current has free passagethrough the resistance, probably by "reason :of condenser action of the parts composing the resistance.

While in `describing the inventionv reference has been made to particularexam les embodying the same I wish it to beun erstood that my'invention is not limited to the construction shown in the drawing, and that various changes may be made in the eneralarrangement of the'apparatus and e construction of its the invention. yIclaim: y. Y

1. A 4system for unipolar high frequency parts without departing vfronr treatment, comprising a primary oscillation l circuit, a secondary oscillation circuit, a Tesla transformer having its primary and secondary respectively included in said circuits, a device connected with the high potential terminal of said secondary for receiving an electrode, and a protective condenser disposed lbetween said device and the primary oscillation circuit. E i

2: A system for unipolar high frequency treatment, comprising a primary oscillationl circuit, a secondary oscillation vlcircuit, a Tesla transformer having its prlmary and secondary respeetlvely lncluded 1n said cirlcuits, an electrode electrically .connected to 'the high potential terminal of saidy secondary, and a protective condenser disposed between the electrode and the: secondary of the transformer.

3. A system for unipolar Yhighfrequency treatment, comprising a primary oscillation circuit, a 'secondary oscillation circuit, a Teslatransformer having. its primary and secondary respectively included in said `circuits, a device connected to the high poten-V tial terminal of the secondary `for receiving an electrode, and a protective condenser between. said device and the secondary.

4. A system for unipolar high frequency treatment, comprising a primary oscillations circuit, a secondary' oscillation circuit, a Tesla transformer having its primary and secondary respectively included in said circuits, a disk connected with the high poten#` tial terminal of the secondary, a disk'con nected with amember adapted to receive an electrode, andan insulating plate disposed between said disks, said disks and insulat-V in'g plate forming a condenser.

' 5. A'system for unipolar high frequency treatment, comprising a primary oscillation circuit, a secondary oscillation circuit, a Tesla transformer having. its primary and 'secondary respectively included in' said circuits, a disk connected with the high poten- Lial terminal of thesecondary, a disk con-- nected with ya member adapted to receive an electrode, an. insulating plate disposed beiiveen said disks, said disks and plate forming a.condenser and a spring acting on one o'f said disks in a direction for forcing the same against said insulating late. 6. A .systeml forV unipolar igh frequency treatment, com rising a primary oscillatin circuit, a secon ary oscillation circuit, a Tesla transformer having its primary and secondar'y. respectively included in said circuits, a disk connected with the high potential terminal of the secondary, a disk connected with a member adapted to receive an electrode, an insulating plate loosely disposed between said disks, said disks and plate forming a condenser and a spring acting on one'of said disks. in a direction for forcing the same against said insulating plate.

In testimony whereof I aflix my signature;

HEINRICH HERRMANN. 

